Responses
Very true got confused why they needed sex at the start.
For me it was more like Kei percieve sex and violence as a medium to achieve things in life. Once Yutaka decline or was reluctant to the first blackmail, Kei sum add the coercitive sex to the "deal". I'd say at that time Kei started to feel interested in him so he wanted to do it too, it would be the first time he desire sex not as a deal.
From the very first time they had sex, I didn't feel like Kei was blackmailing Yutaka to have sex with him in exchanging for him not to expose his sexuality. All Yutaka had to do was just letting him stay at the dorm and Kei would shut his mouth. It felt more like Kei was offering himself to Yutaka in exchange of letting him stay, and the way Yukata kept coming back for the sex with Kei voluntarily just kind of giveaway the fact...
This manga is really great...really with characters that have realistic backgrounds and I like how they demonstrate Kei's mind like that. But the issue of how they started sleeping together was kind of contradicted within itself. It was the only one thing (one important thing as the start of their relationship) that didn't make sense.
I know that Yutaka was enchanted with Kei from the very first time they met and Kei seemed to be drown to Yutaka for his warmth as he didn't wanna be left again, now that their relationship (and sleeping together) makes sense anyway.
PS. These two kind of got reminded of Christian and Oliver from Verbotene Liebe. (▰˘◡˘▰)