When i was 14 my mother kicked me out of home. my best friend at the time took me in, he was atleast a size smaller than me, but because i had no clothes obviously i had to share his. i used to get an instant erection the minute i put on a pair of his calvin kliens, they was skin tight on me which gave me an instant hardon. What turned me on more was that he would ask my opinion on what he looked like in certain jeans/trousers knowing that he was comando! and i could see every bulge of his manly anatomy.
Also because they was his underwear i couldn't just come out of the shower and get changed, no i had to wait till he was ready before i could get changed (which not being funny, for most that would be a bad thing)
But for me the thought of him watching me put my cock into his tight CK briefs (which he did actualy stand and watch) turned me on big time!!
The whole six months that i lived there it was the same procedure, i would shower then mark would shower i would have to wait till he was ready before i was aloud to get changed, but considering that he had a huge beautiful cock i never once complained.
And also while i was waiting to get changed he would always give me a quick fiddle. and sometimes if iwas lucky i would get a full on wank. But i've got to say he always let me grope him, he never complained, (Don't blame him, Do You?).