A Good Clean Wank

Ivy is on the stairs cleaning, instead of being a helpful person, you decide to stand there and look down Ivy's shirt as her massive natural tits jiggle about. Ivy notices what you're doing but can't button up her shirt as it is too hot! Ivy wants to make a deal with you...you can get your cock out and wank it over her, but you have to pay more towards the rent and you've got to clean the bathroom when you're done. Fair?