A woman who constantly tortures my nipples and smiles while making her erect

Kotaro, who has weak nipples, works hard at muscle training to fix his weaknesses, but even as his body becomes stronger, his essential nipples remain as sensitive as ever. One day, my mother's friend Nozomi arrives at my house... Nozomi is in agony from having sex with her husband, but once she learns of Kotaro's erogenous zones, she changes drastically, and while she is unaware of those around her, she plays with his sensitive nipples. Kotaro responds to the pleasure of being sucked and licked over and over again, and is confused by her first experience, but becomes obsessed with her nipples...