Forgetting to spay your Astartes is something many do, you were one that forgot. Course naturally you didn't think that'd be that big of a deal, there weren't other Astartes nearby, how could you even end up with marinelings from him?

But you were wrong.

Now sat in your basement, helping your Astartes feed his marinelings as the little ones run around. Your Astartes sighs leaning on you, tired from his marinelings.