summertimeother1
The "follow" system only goes as far as "move with me wherever I go" with lesser effects if the girls aren't as close to you. The maximum of 2 girls on-site still applies, generally followers will silently displace other residents but for things like love confessions the other girl will ask your followers for some privacy. There is a tiny trick where you can ask a girl to follow and immediately disband to reset her location to her normal schedule, unlike asking her to leave she might choose to stay in that room so you can return within the same time slot without searching for her again.
As far as "plans" go I don't remember anything major, but if you have Kitty following you around you can have her break into Xavier's office at night (used to yield some raunchy pics I believe). The more common use would be around the time where a girl is willing to have sex but not in public so you ask her/feel her up and then make her follow you back to your room. Also the most reliable option for setting up threesomes although asking the girls to come over via phone is more convenient. Sadly there is no dedicated scene for talking Emma into going commando then having Kitty yoink her outer clothes while she's teaching.
I haven't really figured out a "speedrun" for Kitty, she seems to be quite shy in public and doesn't start out with any easy gateway unlike Rogue. A lot of early progress will depend on low point grind or RNG/savescumming from what I can tell. Compliments (the correct ones...), hugs and head pats work well early and later you can farm quite a lot of points from the tit grab "flirt" option if you keep fondling. As soon as you can get her in her room or yours start asking for soft stuff and if that fails try studying together and hope she goes for cuddles. Once she agrees to sexual petting (in your/her room, when you ask straight up from the normal dialogue menu) you can try each option once to gain a huge number of points. Always ask to do something instead of "sneaking" it because otherwise you don't seem to get the points even if the girl accepts it anyway. On that note, the "stick a finger in" actions do grant such a bonus and are only available under "shift primary action"/"offhand action", sucking breasts and licking pussy also need to be unlocked that way from touching breasts and thighs/pussy respectively.
If you can afford it Kitty definitely is the one to give early gifts to (probably books first, not dildos or underwear...) because Rogue loves you(r power) anyway, Emma has her masturbation scenes and easy room invite and Laura basically throws herself at you unless you actively piss her off.
