Is this gay what happened?

You kissed him on the chest...... this isn't a typical place for a good night kiss...

On the homosexual front. Really difficult to say, you could just be curious or excited for the simple fact you kissed someone in bed.

Not only it is gay, it's also incest.

If you're going to experiment then for God's sake don't do it on a relative. Also I voted gay to troll, this doesn't seem overly sexual.

Gay but cute, reminds me of me and my big brother. >w<

U kiss your brother chest when both of u half naked in bed then u still ask if the act gay or not? O.O

I girl and I adore gay so much but with a brother or relative is it not normal at all O.O

P/s : are u love him more then just a brother or are u guys fooling around?

Suck him off and you will be sure!

If you are wondering if you are gay then you just haven't sorted your own sexual desires out yet.
Don't label yourself so early on in life.
Its ok to be gay, but most aren't.
Children usually play with the same sex friends for many many years before looking at yucky girl germs :D
Oh I'm not gay, just providing a boy's point of view.

Its a YES! 100 percent. How would you not find this gay. Also I agree with skull. If you want to experiment do it with someone who ISN'T your family.

If you got excited in a sexual way, then yes, it's pretty much the definition of "gay". If you really want to find out if it's just curiosity or not, you can go for a little "more", assuming it's consensual and you are both of legal age.