This is funny. Since you trust your friend, why not send directly to his wallet and he also send directly to your wallet and after that you guys can send it back to one another.
Of course, I just don't understand what he wants. If he and his friend trust each other, they can make transactions between them, but the transactions he proposes to make are a bit strange. Using an intermediary, which would have to be a trusted escrow, otherwise there is a risk of losing the money, is usually when there is not enough trust between the two parties.
And adding a escrow also costs money, as he will charge for the service.