IESP-726 Rina Masako's Lesbian Ban ~I'm Manipulated By My Sister-In-Law's Tongue~

Rina's husband had an older sister named Hana. One day, Hana suddenly came to Rina's house. The only child, Lina, is happy to live with her sister-in-law, but from that day on, her chastity gradually collapsed... Even though she is newly married, she is already sexless with her husband. Was there loneliness or a gap in her heart? The tongue of flowers gently covers everything.