Even though this here gets often paired with Insects, which I don’t really enjoy, this here is far better.

It often plays around with people getting infected with some living creature and then having to carry it around with them, while it pleasures them or something similar. This of course can play very nicely with Living Clothes or Hidden in Plain Sight. In more extreme versions, it also features Cervix Penetration or Nipple Clamps|Penetration.