Happens everyday
Why are you even browsing B to begin with?
It happens basically all the time on /b/. /b/ is trash. As long as you didn't save any garbage, you're fine.
lmao actual cp is rather rare on /b/
there may be some questionable teen stuff but I've seen a lot of people mistake researchstars like monroe ( whos in her 20s iirc) and that 20 something year old asian who looks 9 or something as actual cp since they (or at least monroe) end up getting posted regularly as webms on 4chan
it just looks like you guys are trying to make /b/ ultra evil and up to no good
OP, if you came across it on there you don't have to worry about it as long as you didn't save it or anything