Is it normal my gf wants to see my cum after wanking?

So me and my GF were sexting a few days ago, and we both came etc. She then asked me to send a picture of my cum on my hand? I tried to research it, to see if it was common, because id never thought anyone would want to see it,but nothing relevant came up. Im probably reading into it too much but I just think its wierd for her to want to see a picture of my cum covered hand?