Caught

Don’t wear any underwear so when you get hard she will see. Then make sure she sees your bulge and apologise for it. Or of course subtly touch yourself while with her and with a hard cock and see if she says anything. Then can tell her she is stunning and you think about her lots. You can’t help it. Get your cock out and stroke for her and just as you’re about to spray while staring at her hot body, she can kick you in the nuts and cum on her foot before she kicks you out

Drop in to see her in the evening or go around for dinner. Try and make sure the kid is busy or asleep. Go to the bathroom at some point. Leave the door open a bit. Maybe find her underwear, start masturbating, take a long time. She will come to find you. Hopefully you get caught. Good luck

Rather than trying to get caught why don't you try having a relationship with her? Start taking her out.

Yes take here out get here horney buy arsking her about her how her sex life is hopefully she says she has none atm. Then keep her interested and she will stay wet hoping you are into her tonight. Say something that will get you back at her place for the night letting her know your not looking for relationship atm but you see a girl you have been friend s with since we were kids and when she gets lonely she has me come over . Then put it to your cousin that u what to masterbate now and go to her bedroom