Oh I have a whole post about this a while back but in my mind each ship has like...a default position that sort of encapsulates their vibe? If that makes sense? It almost represents their dynamic
Anyway for Wrioney (hear me out!) I think that position is Missionary. They're so disgustingly in love that I think they could get off just from making eye contact tbh, and Lyney would feel especially safe with Wriothesley over him like that. It also allows them to kiss the whole time and you KNOW they're a "let's just make out for a couple minutes...oops that went further than I expected" kinda couple lmao
I could also see Lyney sitting in Wrio's lap being a favorite, because it's still very close & intimate & good for kissing, & Wriothesley would enjoy the view haha. This would probably be one Lyney enjoyed when he wanted a little more control, too - although in my mind something he loves about sleeping with Wriothesley is that he doesn't feel like he needs to be in control because he /is/ so safe in his hands.