I just wanted to suck his cock

I’m 35 years old. He's a friend of a friend.  We got together to masturbate, or that's what I thought or told myself.  But really I wanted to suck him.  Then I saw his cock, and when he came, it was big white globs of cum, and I couldn't get it out of my mind.  I really wanted to suck him, and taste his cum, but I was afraid he would tell our friend I was gay or something.  But the third time we got together, he let me masturbate him, and that was so hot.  He came all over my hand, and I licked it.

Something told me to "just do it", that when he was really turned on, he wouldn't care.  So the next time we were together, he was really stiff and gushing precum, and when he was ready to cum, I just got down and filled my mouth with his cock and started sucking him and stroking his balls in my mouth with his tongue.  I was so excited.  Really quick, I felt my mouth filling with his cum, and his cock was slimy and slippery in my mouth. 

He hardly said anything before he left, but he called me in a few days and wanted to get together, and I sucked him again. Now he calls me when he wants to get off, and I love sucking his dick.  We can't tell our friend because she would freak out, totally.  All I can think of it the next time I'll feel his load filling my mouth. 

Sometimes this is really cool and natural, and sometimes it's really weird and perverted, but I don't think we're going to stop.  He has a girlfriend.