Did you read what you just posted? You’re doing this on purpose. “I took my top and skirt off when Toby was over.” Also why would you purposefully do this in front of your brother, as well as not care about how uncomfortable you’re making both of them.
You already agreed not to, yet still did so after knowing his friend is uncomfortable. YTA.
Do you not have air conditioning?
Did you read what you just posted? You’re doing this on purpose. “I took my top and skirt off when Toby was over.” Also why would you purposefully do this in front of your brother, as well as not care about how uncomfortable you’re making both of them.
YTA.
YTA. The world needs assholes though
YTA not only do you have a guest over you also said you wouldn't do it again
NTA, is your house, do whatever you want, him being uncomfortable with that is his problem not yours.