when aunt peg gets on BALL duty from behind him, I told my friend how awesome that must feel, and so he arranged a threesome with his wife, and never told me his plan, but as i was fucking her like that, he was next to her kissing her tits, then he suddenly reached his hand behind and between my legs and did the exact same ball rubbbing on me as i plowed his wife. I lasted exactly 10 seconds after he started, and he milked me into her. she didnt even know he did it until she asked me why i suddenly got so hard and came so fast. thats when he told her he wanted to make sure he got all of me drained into her. unfortunately they moved soon after and i never heard from them after that. would love to recreate it. having your balls rubbed while fucking doggy or missionary is the best, male or female