Momo has been in love with Suzume for years and is heartbroken by the string of men Suzume sleeps with. So when he turns eighteen, he begs Suzume to give him a chance. This is very sweet and loving, with only a hint of BDSM. The focus is more on Suzume's internal changes and very little on the actual sex.
Osanajimi ga Do M de Tsundere Nan Desu ga