No, you won't let her

'I'm sorry, honey,' you tell her, desperately trying to keep your mind clear. 'I just... can't do that to Frank, I'm sorry.'

'Such a shame,' she pouts. 'Maybe another time though, when I've disappointed Frank?'

'Please don't say that,' you say, feeling a little sorry for him, but hoping he has a very large cock as well, as that's all she seems to care about.

'Alright, alright,' she says, a little irritated. 'Maybe I'll fuck him, if that makes you feel any better? But I don't see the point, when I clearly want you or John.'

'It would make me feel a little better actually yeah,' you say, relieved. 'I bet he can satisfy you just as well...'

She sighs, and looks down at your massively hard cock with a sullen expression. 'I doubt it... Can I take a selfie with it before I go though? Just to make some girls jealous.'