Long ago, I went to the local swimming pool. There I met a female friend. After the swim, we lay down on the grass area. She changed into red cotton underwear, I lay nude in the sun (Europe). The sight of some lady gave me a boner. She (my friend) saw it, and her panties became visibly wet, the stain took about half of fhe front of her panties. Seeing that sure kept my boner alive
