Just drown in me Vol.1 (TL Manga)

I want you to marry me. But first, I want to taste you.
Mari is a plain office lady who's never had a boyfriend, until the hottest guy at her company, Kitamura, proposes to her. He also says that physical compatibility is important, and fondles her!! Kitamura's seduction just keeps getting more and more extreme... He doesn't even like me... But then why does he keep coming back to me? Vol.1, 50 pages.