Pi Pi still play kiss, but with Kui Kui

Yesterday I scare Pi Pi very lonely, so I put Kui Kui with Pi Pi.
But really can see the difference of non-partner.
Because they don't play together.
If they are partner, one of them must climb on another.
But they don't have.
When sleep, also not close to each other.
But very weird, today on 7pm I walked down starcase.
And I go to kitchen, I saw Pi Pi and Kui Kui play kiss.
That Pi Pi so naughty.
Di Di hilang.
He looks like very enjoy having fun with Kui Kui and play kiss with Kui Kui.
Before that, Pi Pi got play kiss with Di Di.
I got took picture and upload.
Unfortunately this time no luck to take photo.