My stepbrother convinced me that the sauna feels better when you're naked, and he was right.

I walked into the sauna, annoyed, and immediately turned it off. My stepbrother looked at me, and instead of arguing, he convinced me to stay with him. He told me the sauna is much more enjoyable without clothes ,that the heat hits differently when you're naked. He eventually won me over, and I agreed. I took off my bikini, and the atmosphere shifted completely. He started running his hands over my body, I let myself go, and we ended up having intense sex, sweaty and pressed tight against each other. I never imagined a simple invitation would end up like that.