Me and my brothers Best friend just kissed?!?! But he is also my close friend?? So is that ok?

ok so my brother and his best friend (my brother is 12 and his friend is 13 and im 13 ) came over to our house and they were hanging out downstairs so i went down there to see what they were doing and they were just watching tv and having a pillow fight (me and my brothers friend are good friends to we are in the same grade and our lockers are rite next to each other) but anyways my brothers friend said here take a pillow so i did and we had a little pillow fight and my brother had to go to the bathroom and was gonna bring us some drinks down so me and my brothers friend just continued having a pillow fight (he said he thinks that i am cute and i think he is cute to he told me that about a week ago)but anyways somehow we both ended up on the ground and we were laughing and then he just leans over and kisses me and then he leans back and said "ohh umm sorry" i smile and then we both lean in and start to make out and then we stop and my brother walks in and says "why are u on the floor" he says "we fell haha" and then my brother brought the boom box down and we started listning to music and having a pillow fight and then our mom called my brother back up to get pillows and blankets and me and my bros Best friend made out again and then like later on my brother fell asleep and me and my bros best friend were the only 2 awake (we put two air matresses down there one was a full and the other was a twin and it just so happend that my brother was sleeping on the twin and his best friend was on the full) and scince we were the only two awake he asked my to come down there and so i did and we cuddled and made out like half the night... then we both fell asleep and thank gosh i woke up first and then i went in my room and then later on they were both up and they were playing video games and when i walked in all's we could do was smile and laugh and my brother asked whats so funny and we looked at eachother and just started to crack up and my bro was like what what! and then my bros best friend said the way you sleep and then we just smiled and my bro was like ok whatever but it was funny but see the problem is i dont know if i should tell my brother what happend but then he might tell our parents or something or just i dont know what to do what should i do?????