Well I'm actually throwing up now because I'm ill :( (TMI I think lol) and I think it's worse throwing up on yourself because you're the one that has to clean yourself up XD
I'd go with throwing up on my 日付 because I'd be the sick one and I really don't like the idea of me throwing up on a guy. If it was the other way around then I'd just have to throw away my clothes XDD And I get to take care of him 0w0