I just want to point out that Emily IS gay.
She was put off men by her abusive father and has had trust issues with them and was never interested in them romantically, that's until the MC came along.
The MC shows her that not all men are like that and she grows fond of him, maybe a little too fond
Due to her issues, she's never been with a man before, only women.
On day 1, during the night, that was the first time she's ever held a dick and maybe it's awakened something inside, something that she didn't realise was there.. A hunger for something... Different..
The lesbian content will also help bring around the corruption of other girls.