So, a bit more about tonight. We put saddle on Puika and took him out. When peter was leading him away from barn, Puika already started call for Shella! It was fascinating.
Peter went on Puika (this time Puika was not interested even in his lead, he just stood there like an angel, very unusual) and then started to show off - prancing, and parading like he is leading the show.
I went back to barn and took out Shella. When Puika saw her… OMG, it was something. He pushed the saddle back becuse his chest probably doubled the size. My mum said that she never ever before had seen such a PROUD horse!
Shella was very casual, like she can not see any boy there 
Then Peter let Puika to move towards her, and we just stood still, letting them both sniff each other. No agression both sides, so far so good. So peter slowly turned Puika around until I led Shella to the gate to mount her - it was easy job, she is well trained so I did it by myself and she instantly took her way to the main road (it is safe as she is used to all sorts of cars and trucks, and is not frightened at all). She was just in halter, and i sat bareback on her.
Puia followed as a baby. Only smoke probably was coming out of his nostrils and ears - he was so full of power! He was trotting these short steps, knees high up each time, like marching on dressage competition.
We went down the road and peret let Puika to go side by side with Shella - Puikas eyes were so full of happiness, it is not like human emotions, it was his emoutions, clearly all over his face.
Then Shella started to breathe heavy, had few coughs, so I unmounted her and walked gently back (BTW, is it possible that her hoofs are cut too short so he does not feel happy walking on the road - she tried walking all the time on the grass, and did not seemed happy walking on hard surface).
Peter was riding Puika with us - and Puika was not interested to leave her at all, like they have already bonded and he is already willing to follow her whatewer she decides to go.
I took her back inside first, Peter was holding back Puika in the yard . When I came out and Peter unmounted Puika, it was quick dragging me stright back to box in case if Shella had missed him the past 3 minutes 
the main idea of getting Shella was to keep Puika happy. keeping me happy with much easier horse was a bonus. Seems like both targeds we have had hit! Puika is not only happy, he is extatic about the first girlfriend in his life!
And I’m happy as Shella is not only well schooled horse, but such a calm sweathart, just perfect for me.