twinsex

When a twin has sex with their siblings girlfriend/boyfriend while pretending to be them.
1: My brother just tricked my girlfriend into having sex with him by pretending to be me, should I murder him?

2: That's some messed up twinsex right there dude. I would definitely murder him. And John, I'm here for you if you need me.

1: Ok, thanks for the help girl. Now that you mention it, I could use some company tonight, I'm feeling pretty despondent.

1+2 Have sex.

2: That was amazing John.

1: Well, that's because I'm his brother Dave, Johns still crying about me banging his wife.

2: *Murders Dave*
by J.I.V.L March 05, 2016
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