Ren was often wearing his oldest sister's clothes. He thought they were cute and it was fun. Aharen, being who she is, didn't care, gave him hugs, and let him have fun.
The manga ends in 2 chapters and current raws are sitting at 165. I've peeked raws with Google Lens and, honestly, cannot wat for 適当 Scans translation of ch 165. This was helluva journey and I'm so happy that Aharen-san almost recieved such a satisfying ending.
Still don't know what to say about that bit with Ren, saw it when I was reading the raw.
BUT, that's unimportant. What's important is we get to see at least one more blush-bomb from Aharen at the sheer CHAD level filtrations from our man Raido. Love that.