cuckold by my virgin girlfriend part 2

my friend's proposal and my body wants to become a cuckold.

A few weeks passed, and my grandfather would let us be alone in his house. Sometimes he would spy on us, other times he would just leave. He was happy about what my girlfriend had done and no longer wanted to interfere between me and my girlfriend.
Meanwhile, my girlfriend and I were starting to explore each other.
I would take off her blouse at my grandfather's house. We would go once a week just to try her beautiful breasts. I would kiss her all over, but she still wouldn't let me put my hand past her waist. I was being patient, not wanting to rush her too much. She would masturbate me sometimes.
I started suggesting she give me a blowjob. She told me she didn't know how to do it. I told her we could learn together.
Little by little, she would provoke me, hinting that she would do it, but she was just pretending and didn't touch my cock with her mouth.
It wasn't until we were almost eight months into our relationship that I finally convinced her to give me a blowjob. It was a bit clumsy at first; she just sucked on my glans and didn't go any further.
In my neighborhood, I had a friend two years older than me. He was a guy as virginal as I was. He liked my girlfriend, never telling me, but we both caught her attention before she even became my girlfriend.
He also had a girlfriend, a girl his age, whom he'd only been with for a month. He'd tell me what they did, and one day he even told me he'd show his girlfriend giving him oral sex if I showed him my girlfriend giving me oral sex.
I didn't want to admit that Carolina had never gone deeper than my glans into her mouth.
I told her I'd think about it. One day, while we were having sex, Carolina was wearing very short shorts. I had taken off her blouse and bra. I was caressing her small pink nipples with my mouth. She was moaning softly. We were sitting on my grandfather's bed.

Carolina caressed my penis with one of her hands. I tried to put my hands under her shorts, but she always pulled away, saying she wasn't ready.
After almost two hours, she leaned over to suck the tip of my penis and alternated using her hand. She knew when I was about to cum. She'd become an expert at handjobs.
This particular day, my erection had lasted longer than usual.
Carolina: "What's wrong, my love? Can't you cum?"
She knew how to provoke me. She seemed to know I wanted to tell her something.
Me: "Yes, I want to cum in your mouth."
Carolina: "I only did it once. I didn't like it very much, my love. You came and didn't tell me."
It was my mistake. Being a first-timer, she didn't know how to react, so I was having a hard time convincing her to do it again.
Me: "Just this once."
Carolina: "I don't know..."
I continued with my erection for a couple more minutes when, in the midst of lust, I said:
"Remember my friend Daniel?"
Carolina: "Yes, the one who's older than you."
Me: "Yes, he tells me he wants to see you giving me a blowjob, and in return, he'll show me his girlfriend giving him a blowjob."
I expected her to get angry. Carolina spent a while thinking and it made me nervous because she had my penis in her hand, but instead, she gave me the most naive and horny answer in the world.
Carolina: "Good idea, love. This way, you can show me how your girlfriend gives you a blowjob, and I can learn how to please you better."
Instinctively, my penis got harder and had small spasms.
Carolina: "Does the idea of someone else seeing me giving you a blowjob turn you on?"
She sped up the pace of her handjob, ready to make me cum. She masturbated me while her mouth circled around my glans. I was about to cum when she took her mouth off and I started ejaculating in her hand.
Carolina: "You like me. Let's see how much you cum when your friend sees us. I want to see your friend's girlfriend giving him a blowjob. When I learn how to do it, I'll let you cum in my mouth and eat it all."

Would you like a short section detailing Carolina's sexual progress?

Example:

Carolina:

Relationship status: In love with Juan.
Sexuality: Heterosexual.
Sexual preferences: Older boys.
Sexual encounters:
Juan (boyfriend).
Juan's grandfather.
Virginity:
Mouth: 1 penis, 0 blowjobs, 1 cumshot.
Body: Her body has been explored by two men, but only her breasts.
Virgin: Yes, intact from the waist down.