Made My Son In Law Masturbate

My son in law comes for a visit once a week to take me food shopping and we go for a coffee to catch up on things.
I had a rash on my shoulders so i had got some cream to apply when my son in law turned up i asked him if he would help me rub it in .
I slipped out of my dress standing infront of him in my bra, knickers and tights ,he stood behind me and started gently rubbing the cream on to my shoulders.
I suggested i remove my bra as the straps we in his way,
I dropped my bra on the floor and cupped my small breasts with my hands and let him carry on every now and then i could feel his erect cock just touching my bum i knew he was really enjoying what he was doing .
After a few minutes he announced that the cream was all rubbed in i rewarded him with a glimpse of my breasts by removing my hands and turning round to pick up my bra letting him get a good view of my breasts and erect nipples.
I looked at him and as i guessed he had a big erect cock in his trousers i smiled at him and suggested he go into the bathroom and deal with his hard on before we go got .
He said he would embarrassed he went off to the bathroom i crept up to the closed door and listened as he had a wank he was talking in a low voice couldn't hear much apart from my name every now and again.
When we went for our coffee i asked if he had a nice wank fantasizing about me he was a bit embarrassed but he said yes .