Basically, just the process of putting something large into your genitals. Be that dildos, plugs or any other kind of sex toys, or even a large penis / some other kind of object.
Married Life by Rubber Phantom
Married Life by Rubber Phantom (Archive Link) Really nice story about a married couple and their weekend they spend in latex. The story is told from the perspective of the husband and focuses on the complicated, multi-layered outfit he gets in. Usually, I’m not really into fetish stories told from the male perspective and where a male character gets bound, but this one still kind of hit right. ...