[ModelT-MsDollie]

Maybe this fits here. We never did scuba dive but swam and used fins and goggles a lot.
Way before this we had two clear lakes we'd swim in before and after we got married.
This happened both before and after marriage. We'd often go to either lake and end up fucking in the water near the edge of the lakes. Later we'd fuck in any body of water we could, from the Atlantic ocean, Lake Michigan, Smokey Mtn streams, pools, and hot tubs. The very first time hooked us being watched so it became a life long hobby!
The first two, most memorable and exciting, were #1 with Charlotte, our live in GF. Dollie has never been into women but several of her HS GF's would visit or live with us.
We were at the more distant lake. Ended up doing what we did a lot, fucking in the water. Charlotte would dive down between my legs and watch as we fucked. It was common for Charlotte to feel my penis and shrived balls as I fucked Dollie. Charlotte would scoop up my semen as I shot inside Dollie. This happened over many years. We'd be around waist deep and the lake was clear and cold.

#2 was at the gravel pit lake which was very clear. We'd go to a secluded cove with woods around. Old men were known to fish in those areas. At first we just imagined being watched. Later we saw some old men watching us fuck. It was such a turn on we did it often over many more years.
Fucking in cold clear water and cumming was amazing. A pussy would shrivel up so tight it was difficult to get inside. Of course it sometimes was difficult getting an erection. However fondling tits and knowing we were being watched helped.