My wife wants me to get her best friend pregnant

I (34M) never imagined I'd be writing this. My wife Emily (33F) and I have been married for seven years with two amazing kids. We've had an unconventional but incredible relationship that includes her college best friend Sarah (34F). What started as a drunken threesome in Cancun during spring break evolved into an amazing dynamic between the three of us.

Sarah's been like a second mom to our kids since day one. She's there for every birthday, every milestone, and even helps with nighttime routines when she stays over. The kids adore their "Aunt Sarah". She's independent, successful, and has never wanted to settle down but lately, she's been talking about wanting a baby.

A few days ago, after we put the kids to bed, the three of us were relaxing with a couple of drinks. Suddenly Emily said something that's been keeping me up.

"What if Mark was your donor?" she said to Sarah. "You've seen what amazing kids he makes," she added with a wink.

I nearly choked on my drink. But as the conversation developed, it was clear this wasn't just a passing thought. They'd been discussing it for weeks. Sarah's been researching sperm banks but feels uncomfortable with the idea of an anonymous donor. Emily thinks it's perfect, Sarah gets a baby from someone she knows and trusts, and our children would have a half-sibling they already love.

The kicker? They don't want to do it through a clinic. They want to do it "naturally" because of our existing dynamic. Emily says it would be more meaningful, more intimate. Sarah blushed when she agreed, saying she'd prefer it this way too.

What's fucking with my head is how excited Emily gets talking about it. She can't hide the excitement at the idea of me getting her best friend pregnant, just like she was when we were trying for our kids. Sarah keeps giving me these shy looks that drive me crazy, and I'd be lying if I said I wasn't attracted to the idea.

I know I should probably say no. This could complicate everything. But watching them plan and discuss it, seeing how much they both want this... I'm seriously considering it. The thought of having another child, this time with Sarah, with Emily's blessing and enthusiasm, is starting to feel right in a way I never expected.

The most surreal part? Emily's already talking about how our kids would love having a little brother or sister at "Aunt Sarah's house." She's planning playdates and family vacations like it's the most natural thing in the world.

Am I crazy for even considering this? The legal implications alone should terrify me, but somehow they don't.

I think I'm going to say yes. God help me, but I think I'm going to do it.