Men's underpants in my laundry

Not nearly as exciting as it sounds, but it still had my heart aflutter when I found a pair of navy jocks in the laundry the other day.
It''s been six months since I did any laundry for a male over the age of 12, and it's certainly not something I plan to do again in a hurry.
It was no mystery, no wild tryst, just the remnants of doing a friend, also recently separated, a favour by letting him use my waching machine while his is bung. (No need to read anything into the word *friend* or pronounce it with a raised eyebrow as my mother might, he really is just a friend.)
But, still, I found myself looking over my shoulder to see if anyone else (who else? the children, cat, dog or chooks? I can hear them know going begeeeerk as chooks do when they look sideways at you) might have witnessed the blush.
What should I do? Should I acknowledge the jocks loudly to make sure I wasn't covering anything up?
Should I sweep them under the washing machine with the dust bunnies for the removalists to find should we ever move house?
Should I phone the owner and laugh, casually, about the discovery and invite him over for tea and slip them into a shopping bag with a dozen fresh eggs and some blueberry muffins?
Or should I just toss them with tongs in the wash with my darks? (At this stage I had not checked cleanliness of said underpants and did not plan to!)
I chose the last option, tossed them in and thought of England.
But alas, the cycle ended, it always does, and I had to deal with the drying phase.
Sunny day, so they should go on the line, but what if the neighbours see? What if the husband pops in?
Can't use dryer, electricity bills to think of, so will hang discreetly on inside airer between hockey skirt and socks still on line from red wash. Near a navy school jumper. Looks quite deliberable. Phew.
Now, to the folding!
Where am I going to put them? I can't leave them on laundry bench? I can't put them in the kitchen by the phone to remind me to contact the owner for collection? Perhaps I'll just toss them back in the wash? Without tongs this time. I know they are clean.
Saved by a text.
Owner of underpants sent message to say his son did not need a lift to school in the morning as is our custom. Fine, I said, and by the way, I have your underpants. I found them in the laundry.
I've started leaving bras around the house to make me look good, he says.
Not funny, I'll deliver them in a brown paper bag if I can work up the courage.
Can't wait. I'll buy you coffee.
Lucky I don't drink coffee.
Perhaps, if enough time passes, he'll just forget the navy jocks, and they'll go the place of odd socks.
He's bound to have at least one other pair.