Thanks Suzan!!!
Great drawing!!
I like the see-through part. I'm kind of thinking of a soft, "sleeve" or wide ring thats big enough for two cocks to fit in, (like your picture), tight, but not too tight. I was thinking it might be good as an alternative to anal sex, or maybe it would be fun enough on its own!
Especially if you were lying down together and slowly doing it. I imagine it would feel pretty good!
As far as the first one goes, the shortest double dildo I've seen is 12 inches. Seems kinda long, each person would have to suck in 6 inches before being able to kiss. (It should be comfortable of course) It would be fun to practice though.