That's a nice title. Makes me think of a Kuudere. Also, sweet Vanilla Osananajimi is always a lovely combination.
"If I win, we're having sex"? Well...That kind of makes you want to lose, no?
Also I found it kind of cute how she immediately obeyed him when he asked her to raise her hands...Adorable.
Great ending. Any chance we get to see these...'expressions of love' in all kinds of ways?