Can't I believe I forgot about that.
So yeah, that's something, but I still stand by wanting to see a bit more of these two getting it on in another foursome or even threesome scene.
Lily can be still be straight because she prefers the MC, but doesn't mean she can't enjoy having fun with her girl friends, especially Debbie. With the MC, it's love for Lily, with Debbie and Katie, it's fun and probably not much more than that, but doesn't mean she wouldn't want to do it again, and again, and again.
Debbie's in love with Lily and probably still hopes she can get Lily to fall in love with her, but she seems happy knowing that Lily has at least accepted she has these feelings and that Lily is OK with doing these intimate things with her. Debbie also seems very happy to have the MC as well if you've gone down that route and she did a good job getting Katie's sapphic motor revving.
As for Katie, she'd probably not be best pleased to find out right now that he was having sex with Debbie and Lily before this, but perhaps this night has changed her a little bit. I honestly hope she doesn't go back to being the totally possessive Katie she was before because I think that it would be good character growth for her if she becomes comfortable seeing the MC be intimate with Debbie and Lily because it turns her on and she likes sharing him with her friends. So maybe by making her more and more comfortable as time goes on, it might make her less inclined to rip his head off if she finds out about him & Lily and him & Debbie later on.