Ideas for the remaining 2 stages:
Stage 6: Mewfertiti Park has been infested with Insects and Slimes who lay their eggs into people. Tangle, Whisper, and the Freedom fighters were sent there to deal with the situation but never came back. If the Player is raped, then they will be pregnant for the rest of the stage. They will either give birth at the end of the respective zone or if they die. When they give birth, it will spawn another enemy just like with the squid back in stage 3. By zone 6, they will reach the entrance of a BDSM club with the Bouncer being Mega Man. With the power of the Love Emeralds, Venus brought in Mega Man and and a few other Robot Masters scattered across Mobius and made them another lewd minion of hers. A boss fight begins with Mega Man from there. If you lose, He will bring you to a Cage in which you will have to fuck every single enemy you have faced thus far before being free and fighting Mega Man himself. He will use his weapons to whip, rape, Impregnate and dominate you. If you win, you proceed straight to the boss where you can see Snively and Regina Ferrum using Antoine and Rotor as sex toys while leaving Bunnie, Nicole, Tangle, Whisper, and Sally as Breeding Stock for the bugs. Snively and Regina were having fun before you came along and a boss fight with them ensues. After beating them, you free the tangle, whisper and freedom fighters who still need time to recover from the sex session with Tangle, Whisper, Bunnie, Sally and Nicole now craving for sex (Poor Rotor and Antoine). The hidden Chaos Emerald is in a box with Dmitri's head in it who will ask you to bring him somewhere safe before trying to rape you as you pick up the emerald. The box is located in a crashed Dark Legion ship.
Stage 7: You finally reach Nova City. It's only a matter of reaching Delta labs now. Unfortunately for you, there are Zombots everywhere! In this Timeline, Eggman hadn't unleashed the Metal Virus yet which left Starline alone on the faceship. Sadly, due to the pink cloud, the entire payload of the Metal Virus Spilled all over Nova City! It's infested with Zombots who are also horny because of the Love phermones. Like in the comics, if a zombot touches you the infection spreads. Zeta will be immune given that she was roboticized, Every other character has only has five minutes to complete the stage left as their health meter fills up with cum. If the health meter is full, the girls will get pregnant, turn into zombots and give birth to more zombots thus ending the level. If one character gets fully infected, you can't use them anymore after losing all three lives and using your next credit. Let's say Cream loses all three lives, then you can only use either Amy, Blaze, Tails, Rouge or Zeta on your next credit. Throughout each act Starline will try to guide you to where he's been hiding. Once you've found him, you have tobeat the zombot holding his Warp Topaz and Starline will then use it to find Doctor Akari. Once you've entered the portal and found her, you find Zombot Shadow, Vector, Charmy, Mighty, Ray and Espio trying to rape and infect her. On top of fighting Zombots, you also have to keep doctor Akari from being infected. Once her vagina meter is full, then she will turn into a zombot too and you'll have to fight her. If you beat the boss and protected Akari, she will develop a cure not only for the Metal Virus and turn every civilian back to normal before packing her stuff and heading to Delta Labs with you while Starline decides to search for Eggman. If you fail, Starline will use the warp topaz to keep Dr. Akari and every zombot in a prison cell aboard the Faceship until he can create a cure for the metal virus and offers to help develop the cure for the love pheremones so he can get back to helping Eggman rule the world. Either way, Starline will open a portal to Delta Labs and that leads to stage 8, the final stage. The hidden emerald is in Honey the cat's pussy. She has also been affected by the love pheremones and will dare you to fist her for the emerald(or in Tails' case, knock her up for the emerald) after which she gives birth to it and you take it.
Stage 8: You and Akari (or Starline depending on the ending you got last stage) enter Delta labs, where you are then ambushed by all the previous foes you have fought before getting to this point. In Act one, you have to fight Bocoe, Decoe, Bokkun, and every single badnik who tried to rape you on stage 1 at the same time. In Act two, you have to fight The Giant plant, the vines, the worms, the pirahna plant mouths, the horses, the chao, and the spiders at the same time.
In act three, you have to fight Dolphins, Mermaids, Squids, Eels, Ghosts, Incubis, Nightmare, Succubuses, Ghost Girl La, and Werehog Sonic at the same time again. In act four, Zeena, her clones, the boars, the male dactyls, the female dactyls, nilly, raptors, rider, ruby, Regina, Snively, Mega Man, Zombot Shadow and the Zombot Chaotix (including Mighty and Ray) will try to attack you at once. In Act five, You will face Venus again in bother her slime form and Abyss form. Once she loses, she has a horny Knuckles stall and rape you while she uses the Master Emerald to power up into her ultimate form. After beating Knuckles, you fight Super Venus. If you get all the emeralds, the good ending has everyone on Mobius returned to normal and Mega Man sent back home. If you get the bad ending however, Venus will sit on a throne while you ride her dick reversed-cowgirl style as the camera pans out revealing every single playable character Pregnant and having sex (except for tails who is fucking Cream who is pregnant).