[Rouran Shoujo (tat)] Mesu Ochi Otokonoko no Kekkon

A young man's secret of masturbating in drag falls into the hands of a smiling dominatrix who offers him a choice: exposure to his parents, or becoming her captured and trained heroine. Under relentless femdom he endures rope bondage, spanking, gags, and toys while his body betrays him—breasts swelling from a B-cup to a D-cup across four months of forced feminization. What begins as blackmail melts into willing surrender as Yu-chan learns to crave Yune's every touch, building toward the wedding the title promises.