Watashi-tachi no Himitsu Jijou
from mangago question board
I read it a long time ago so I'm a little fuzzy on the details but it was a straight romance where both the ML and FL had a phobia of the opposite gender and wanted to use each other as exposure therapy. The cause behind the ML's trauma was because when he was in high school his little sister asked him to walk her home when her friends weren't there but he blew her off and she got raped and he blamed himself
Craters Thinks
looks so promising but gonna wait till more chapters collect
Yofukashi no Uta