When my gf told me she had a crush on her (F)classmate

A bit about me and my gf at the time, we both were in our early 20’s. I’m 5’11” black with an average build and a decent 7″ dick, nothing to brag about but I consider myself good looking. Erin, my gf, was asian 5’4 slim frame, c-cup breast, thin waist and a small but cute ass. When we first started dating she made a point about liking girls. She had never been with a woman but she did find women attractive. Now, I didn’t give it much thought at the time, it was just a nice fantasy. Until one day, I get a text from her about this new girl I’m her class, let’s call her Jessie. Erin text me the entire day telling me about this woman and how much she is attracted to Jessie. I’m not the jealous type when it come to women, I actually find it to be a huge turn on. So I ask Erin if she wants to meet up that night, so she can tell me more about Jessie. Erin comes over and as soon as she is in my apartment, she is on top of me. She pushed my down on to the couch and kneeled in front of me. We both love oral, giving and receiving. When Erin gets horny, her first instinct is to start sucking my dick. When she got down in front of me she pulled my dick out and immediately put it the tip in her mouth. Her small hands barely wrapping around the base of my dick as she lick the tip. Then she slid her tongue up and down my shaft getting it completely cover in her spit. With the one hand on the base of my shaft, she used her other hand to stroke me up and down with a little twist at the top. I moaned as her hands worked my wet dick, and then she began telling me how wet her pussy for when she first seen Jessie. How she was immediately turned her by her blonde classmate. How she couldn’t help but imagine kissing Jessie’s full lips or sucking on what she guess D-cup breast. When Erin told me they locked eyes in class, Erin soon start thinking how hot it would be to see those emerald green eyes staring up at her from between her legs. At this point, her hand that was holding the base of my dick was now rubbing her wet pussy. We both started to moan loudly, and she went back to sucking my dick while playing with her pussy. I was starting to tense up and I could feel myself getting close, but I wanted to add to the mood before I came. I grabbed the back of Erin head, using her hair to guide her up and down my shaft increasing the pace. Then I began to ask her if she wanted Jessie fingers inside of her instead, and she moaned on my dick. I asked her if she wanted to feel Jessie’s tongue on her pussy, sucking on her clit, and her hands holding your thighs apart as she licks you to orgasm. When I said that I swear I could hear Erin’s fingers in her pussy, she sounded so wet. Erin body tensed up as she began to shake from an intense orgasm and I couldn’t hold it any longer. I pulled her as far down on my dick as she could go and sprayed rope after rope of cum down her throat.