HELP!! What do I do??!!

Hello Everyone. So I really need help right now. So I have an aunt who I’m superrrr close to (we have a joke that I’m her daughter) . She has 3 young boys and a BF who is the father of them all, they are together, and have been for years. The dad who we will call John is super funny, sarcastic, witty, he is also wealthy, but he’s not selfish at all, he always has everyone’s back. My aunt is a stay at home mom and is really caring and is always doing sooo much for all the boys. I stay at their house alll the time and so does my sister and my mom, but I stay there the most. One night, after we all went to the pool for the whole day, we went back to their house. We take showers, change, get ready for bed, you know. Then everyone sits in the living room and starts watching this random movie John put on after we all ate pizza. My phone dies, (behind the living room is the kitchen, it’s open layout kinda). I go to the kitchen and continue to watch the tv, it’s dark, everyone is on the couch watching the movie. I see John’s phone is on the charger, but as a joke I take it off, and put my phone on the charger. All of a sudden, his phone shows a message from who we will call, Sarah. Sarah, who my mom and aunt know, she’s way older then everyone else but she has got quite a lot of plastic surgery to look a little younger, but everyone knows she’s older. The message says, “I’m so fucking horny right now” I was shocked. (I’m 13 years old by the way). I turn his phone the other way, so the screen is facing the counter, and go back on the couch. I act normal and everything. He comes outside from the patio, says something really funny, and goes to his phone. I see him typing, them he goes back to the patio, starts talking to someone, (which is normal bc he works a lot) but obviously I can’t hear anything he’s saying, then as he walks out of the patio, a little after he goes outside, 2 minutes later I think he comes back inside and acts completely normal. We had a nice night, but I haven’t been able to stop thinking about it, it’s been 2 days. What should I do?