I guess the most "deviant" act I did was sucking the titties of a passed out girl at a party - she may or may not have been underage - either 17 or 18 when I was 20 or 21. I was playing pool in the basement of this house with the only other guy awake. I went upstairs for a drink of water and saw her out on the couch. We worked together, and I always wanted to get a look at her tits. I jarred her a bit, and nothing - so I gave one a squeeze from the outside...still no movement - so I reached inside her shirt and cupped one, still nothing. So I pulled her bra down and got a good look at her milky white titty, capped with a big aerola. At that point, I was freaked out at myself and the whole situation, so I went back downstairs to shoot more pool.
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Of course the little head got the best of me, and I had to go back in for another mission. Told the clueless guy I needed more water, and would be right back. Got upstairs, gave her a couple good shoves - no response at all. So I quickly pulled her bra back down and sucked on that titty for about 15 seconds. Her nipple instinctively got hard. At that point, I wasnt gonna do anything else so I headed back downstairs. I had effectively blue balled myself. Definately not something I look back on with good feeling of my actions - but it happened, and no one was the wiser.
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OK, SICKOS, I am sure that can easily be topped...