I had an experience like this when I was 21 and my gf was 17. We were at her house on new years eve and my buddy was in from college.
After we were all drunk and everyone was passed out but us three, I took her aside and suggested she give us both head. She wasn't sure about it, but as we were watching tv with her sitting on my lap, I pulled her shirt up, revealing her 36D, bra-covered tits.
I started playing with them and let them loose so my bud could see the absolute huge areolas she had. Next thing, we were all sitting on the floor, playing with her tits, taking turns sucking on them and making out with her.
Then I told her she should suck us. She took turns doing it a couple minutes at a time. This went on for an hour before we both dumped loads down her throat.
She told me later he was longer than me, and figured he was aroud 8 inches with a huge curve. Im 6.5x6.
She would have gotten the fuck of a lifetime if she wasnt on her period