What are my starfish doing??

[Slightlydisappointing]

So in my tank I have two pretty standard starfish and they've been pretty much leaving each other alone until recently where one of them is constantly trying to get in top of the other, I had been told that that meant that the one on top is trying to eat the other so I pull them off of each other, I just want to know if this is the case

 

[Ron Reefman]

I'll wager that sand sifting sea star psychology probably can't offer much help here.

My serpent stars did the same thing for about a week and then went their separate ways. No harm, no foul... but maybe one is pregnant?