First encounter I was 20 years old, working in a National park. Gay coworker and I went hiking in a distant part of the park, had intended it to be a day trip but ended up staying overnight in employee housing . Didn’t have a change of clothes and both needed a shower. Were in the community bathroom showering in side by side stalls and he kept blatantly peering over the divide to see me naked. Had to share a roll of paper towels to dry off . That experience broke the ice, the next day - after we got back to our location - we were in my employee dorm room, both my roommates were working and we were kind of tired and dazed, lying on my bed. He started caressing me, then his hand made its way down into my jeans.... he ended up sucking me. Within days we were fucking each other. Not a great experience for me which I have highlighted elsewhere.
Long story short, I was cool with leaving things there and continuing being friends after our contracts ended and we went back to our respective universities. He had different ideas and just started pulling psycho shit on me when he got back to school, which - being naive - I took to heart.
After his antics ended up outing our situation to my parents (long story), I didn’t stray off of the straight path for many, many (too many) years...