受信者 BiFutalover : Ooh... Oooooooh, ok then I get it. Thank you so much for the explanation! 
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受信者 SwedishwhoreLinda : Its a mating thing for canine penises. When a canine is ready to orgasm, he'll thrust his entire cock inside the female and the knot will inflate, making sure that as much seed as possible is pumped into the female's womb for conception
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受信者 hentai_lover_69 : Oh. ...I've heard some people are into that but I barely get what it is lol
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