Elly Is Acting Differently With Sunny...trying To Get Busy With Him?

Elly and Sunny (along with their cagemate Bubbles) are amongst my newest birds and all came to me together so I have left them as cagemates. Took a little while for the two females to stop scrapping but they seem to have gotten their act together now. Well, today was cage cleaning day - everything taken out of all the cages, scrubbed down and sterilized before being put back - so I spent the entire afternoon working with all the birds. What I noticed Elly doing that I haven't seen her do before was to get really close to him on the perch and then slide her head under either his chest or right under his body and keep pressing up on him with the top of her head...almost like she was head butting him over and over again. Then they'd preen each others heads for a bit and then she would lift up the foot closest to him and push it up against his wing almost like she was trying to keep him a leg length away from her and she'd just hold her foot against his side for a while...then she'd dip her head down and start all over again...always in EXACTLY the same pattern. He didn't seem to object so I didn't make her stop but any thoughts on what this means? Perhaps those with much more experience than me have seen this before? I'm not looking to breed any birds right now and so they don't have a nesting box nor does their cage have anywhere that she might use for a nest.

Also got two new birds this past week...a beautiful sky violet male and one I'm going to need your help with figuring out the mutation but I think he might be my first greywing...lovey lovely birds!