On a family holidays, in a hotel room. Teen boy, constantly with people around. I knew he didn't cum for days. He was sleeping deeply. When he laid on his back, I knew it's a good moment to take my chance. It surprised me he already had a boner, it made my job easier. I don't think he was consious. A minute after I swallowed his cum and left him, he rolled over naturally. We didn't talk about this and next day, he was acting completely normal.