Ultimately it comes down to you and what you want to do, and want to do for her. If you don't really have major objections and the consequences of agreeing to it are something you feel you'd enjoy, then go for it.
Our pleasures, whether physical or psychological, are our own. I may never truly understand why my other half was built to be a cuck and he may never truly understand why I was built this way....but we are both accepting and appreciative of what we have with each other and the pleasure we both provide one another. It's very different from the vanilla life some think we should lead, but its ours and we only worry about being us.
Kudos to you for finding a match and cherish and enjoy whatever she permits you to do.