First time with my cousin

I have a cousin with whom we have a very close relationship, almost like siblings. Around 16 years old, my cousin and I would play soccer on the parcel of my uncle's house during summer days. I was amazed by how developed my cousin was at 16 - big breasts, a round ass, and hips like those of a woman in her early twenties... During these soccer games, I would pass her breasts and kick her ass to see what would happen if she got upset or something. One day we stayed late watching TV and both of us were on the same couch, with my cousin snuggled up against me. She started hugging me closer and we shared our first kiss... I was all hot and started touching her tits again... oh, in paradise! Then, more energetic, I went down to her pussy, which had some hair, touched her clitoris, and it was dripping with her juices. She started complaining very quietly so the uncles wouldn't wake up... At that time, I knew my cousin was a virgin, having only kissed once before, but that night nothing happened except for some touching and kissing... But I wanted to go further, my cousin didn't want to, she was scared... We kept doing this in secret, sneaking kisses and me touching her pussy... One day after we went shopping with our parents, I suspected my cousin was alone in her room, so I got excited and snuck in. She woke up suddenly and said WHAT ARE YOU DOING HERE? MY PARENTS WILL BE BACK SOON... I was hotter than ever, not scared at all, just thinking about screwing my cousin, told her CHILL, I JUST CAME TO TALK... My cousin calmed down and realized she was sleeping alone in her room with only her underwear on... csm!!!... I started moving my hand down her stomach to her pussy and started touching it. My cousin was already very hot... She was so wet that she started taking off her thong... ammm... I just wanted to penetrate heraaaaaa... I took off her bra and had all this treat for me... Since I didn't have much time, I got on top of her and tried to penetrate her... but It was impossible....my penis wouldn't go in, her vagina was very closed...virgin...I tried for a bit....when suddenly...hooo!..I felt my penis head enter....but very tight and my cousin let out a small cry of pain....I had already felt it inside...she started to push me in slowly until I put it all in...it was an incredible sensation, feeling my penis strangled by that virgin vagina...My cousin complained of pain for a bit and then she started laughing like crazy.... We were having sex for a while...when we couldn't do anymore, I filled her up with cum, I don't know where it came from, it was pouring out of her vagina, a little more blood and semen, we left the bed with the sheets...my cousin was looking at me as sperm dripped down and I was just standing there too... After that...we kept having sex all afternoon and discovered oral sex...anal, she finished in my mouth, on her tits, on her face...in short...it's another story.