Idk if this is the place to post this but my lip swells like this at the top right from time to time. It’s generally not very painful but it’s uncomfortable. Normally takes a day or two to go down.
To quote Issei on Rias's rack: "They're such wonderful tits, and I love them. I've never loved anything more.... Boobies!" [Highschool DxD Hero] (Episode 0)