His Sister - My Crush

had a friend in school. Most times we played at his house cause i asked him. he was okay with it and i was happy, cause i could see his sis.
His sis was 3 yrs older then us and in my eyes the most beautiful girl in the world.

diring summer we would go swimming in the lake near their house
seeing her in her bikini was very nice. i tried spying on her when she changed, but never managed.

then one night, we were all in their garden. his mom n dad drinking, mumbling.
my friend had already fallen asleep a bit, i sat next to her.
she started to whisper, why i always watched and stared at her. do you like me?
i blushed. She smiled, you are so young, but thank you for the compliment.
a few days later we went swimming again. almost near the end she came up to me, you can follow me to the tree if you like. It was a really big tree and i knew she changed there a lot.
i followed her, saw a naked girl for the first time. touched tits for the first time.
kissed the first time.
and a broken heart the first time.
the next day some guy came to their house, introduced as her boyfriend