Mitsuki: "You called?"
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Honestly, you could repurpose this character back in, maybe with a new look perhaps. NTR is very popular in Japan and F'ing Bakago's Mom is something to consider, especially since Bakago is in it. Lisa is the most popular character in Urban Demons and her role is nothing more than NTR in that story.
I always prefer having it be that you have two moms. Maybe Deku's Mom and Bakago's Mom got married and now Bakago is your step-brother. He does fit in quite well as that angst antagonistic step-bro when you think about it. And he becomes even more angst and hostile not just because you are being treated as Mitsuki's preferred son, but also because while Inko is becoming more enticed into incestuous relations, so is her partner, Mitsuki. Easy way to have a three-sum.
Imagine this being your family in this game:
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You are the one at the end. So... You and Bakago never know who your dad is.
Mitsuki had relations with a man at the same time as Inko. Mitsuki was about to get married while Inko wasn't. It is likely they were having a bachelorette party for Mitsuki for her wedding the next day. They both got drunk and slept with the stripper, who was you know who. Eventually, Mitsuki's husband found out and left her and the kid. Knowing the situation the two were in, they became close, became lovers and got married. Somehow being impregnated by the same guy and already being close friends who had experimented with each other in their earlier years made them very horny for each other. Now you have two moms and a bro who hates your guts. Also this makes more sense as to why Bakago hates you, while you are always trying to be friends with him since earlier days and now trying to be brothers with. Unfortunately, you actually inherited the libido from you know who making it harder for you to succeed in your quest to be bros with the "friend" you look up to as you are constantly getting laid while he isn't.
You know who has a condition that is the reason why he abandoned pursuing anything with Mitsuki and Inko, plus it was a night of passion due to alcohol consumption. I doubt he even knows that he has two sons.
There is a girl with smaller breasts. Ideally, you want to have girls with different body-types and then add in different boob sizes with that to offer flavor. You can add in half-ways which emphasize even more variation. Pear is small shoulders but wide hips, typically has small breasts and a large ASS, but you can also have large and huge breasts as well. Like if you haven't realize from the Mitsuki and Inko images on this post, Mitsuki is a Semi-Pear, while Inko is an Hourglass. Adding in height differences also helps add in even more variation.
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Think of it like this:
Height: Dwarf, Short, below Average, Average, Above Average, Tall, Giant (7)
Body Types: Average, Pear, Semi-Pear, Hourglass, Semi-Hourglass, Rectangle, Semi-Rectangle, Triangle, Semi-Triangle, Pump, Semi-Plump. (11)
Boob Sizes: Small, Average, Large (Mega), Huge (Mega+), Ginormous (Mega++) (5)
Muscularity: Little, Some, Quite, Very (4)
7*11*5*4 = 1540 variations of different body types before you start getting into iffy territories of interest. No one would expect you need just a pure balance of 15 hundred variations or even representation, but it does offer significant value to the idea of what is available within a game that is supposed to make you lower your sperm count after one hour of wanking. I am going to have 50 women in my game, well I have 1540 variations to choose from. That is more of the idea and even with that 50, some of them can be of the same type, just no more than 20% unless it is part of a theme like a Plump or Amazon woman date/sex game. In ideal terms of representation you should have 20% being average, 30% being above and below average (15% for each, below average doesn't necessarily reflect boob size so long as it isn't too much unless that is the theme of the game, lolis with huge boobs), 10-20% fitting some measure above "above average" in some regard, 10-15% fitting some measure below "below average" in some regard (easy way to still have good number of large boob girls is by having most of these girls in this 10-15%, over 50% of that amount be full-pear body shape since that does count) with 5-30% being something unusual between the two, which gives you that unique flare of diversity.