If you have no recollection of sleeping with Aine, you've really not been paying attention to making sure you got on Aine's route. Choices matter in this game. There's even an Emma Solo ending that you probably missed.
Viewing post in [Teasers] MBML Chapter 2 - Episode 3 comments
If you're current with the release thus far, you definitely made choices that kept you off her path. You'd have done the deed with her in CH1 EP3 P2. And I'll mention Emma Solo again, simply because it's achingly beautiful. Mrs. 6 laughed at me the morning she awoke to me having just finished it. I was a wreck. LMAO
So, all that to say, looks like you've another play through ahead of you. Or two. Emma Solo route is found at the menu where you choose between "Pursue your promise" and "Stand for the current situation". Make a save there. "Pursue" takes you to the Emma Solo ending; "Stand" is the canon harem route.