Is it normal that i get hard when walking past a girl in summer ?

hey guys i got a nother one. i was walking home from school and i met a friend that i havent seen in a while *girl and shes alright looking and all but yeh she just walked outa the store door and we talked and hugged i thunk she was a lil bit drunk she kissed me on the cheek which made me semi hard . then we said cya and walked in the same direction and we laughed . kept walking and so on and any way we got to the bit where we had to go seperate ways and we hugged a little bit long *btw for her age her tits are big * and i got a boner and i felt bad and good at the same time anyway she crossed the road and i just kept waling to my house and she ran across the road again hygged me a big hard and everything her boobs were in my mouth nilly lol and she kissed me again and i just stayed there hugging her and she was happy i felt good :) i had a boner and she didnt notice so its all good but i talked to her about it and she said if she relised she woulda give me a blow job i was shocked * this is a real story and yeh i wish now that i wasnt in such a public place before we hugged heaps long if we were some were private i woulda said to her wanna blow me coz i have confidense but she had a friend with her so that was y i tried hiding my boner lol * btw as soon as i got home i jacked off felt grate but normally it pusses out but that time it shot like a meter lol