While my wife was pregnant, I was forbidden to even masturbate, so I ended up having inseminated sex with my mother-in-law, Rena, who had come to Tokyo many times... Rena Fukiishi

Rena Fukiishi, playing the role of a mother-in-law, has an affair with her son-in-law, Saburo, while his wife is pregnant. They fuck in various ways, including she sucking his cock, him fucking her pussy, and he cums inside her.

1. [1:17]They start to develop a connection, she starts sucking his cock and they talk about what they want to do to each other. · blowjob, cunnilingus
2. [31:48]He fucks her pussy, with them talking about how he puts his cock in her and when he's going to cum. · missionary, cowgirl
3. [36:46]They keep doing what they're doing, thinking about what they've done and saying how they feel about it. · fingering, kissing
4. [1:13:53]The pair keeps fucking, trying out anal and different positions like doggystyle and cowgirl, ending with him creampieing her. · anal, doggystyle
5. [1:45:05]Their last times together involve talking dirty about when he cums and him cumming inside her, making their thing stronger. · creampie
6. Rena Fukiishi arrives at her son-in-law's home, initiating their interaction.
7. The narrative concludes with a focus on their personal and sexual bond, exploring themes of desire, intimacy, and secrecy.
8. The title lead confirms the storyline, involving Rena Fukiishi and the prohibition on masturbation, leading to their sexual relationship.