Wandering though the deep caverns of Myrellion, you hear the sound of a scuffle coming from some distance away. Deciding to approach, you discover it to be a botharic and an alpha nyrea - fighting over who has breeder's rights to the nearby beta nyrea that one of them seems to have defeated. Being a good little botharic eggslut, you intervene immediately - ready to mediate with your body. (It's so sad to see these wonderful, strong breeders fighting over something as easily remedied as a shortage of holes!) You volunteer to carry the botharic's eggs, and a foursome commences.
While the breeders stuff you and the beta nyrea with eggs, the two of you engage in some heavy fondling - including, but not limited to: blowjobs, handjobs, cunnilingus, breastfeeding, and caressing of already pregnant tummies. For some truly baffling reason, the beta nyrea is incredibly thankful not to be pumped up with botharic hormones and eggs. You're too blissed out to care deeply, or offer much in the way of a rational argument against her, but you think it would be wonderful for her if she learned the pleasure eventually. The four of you part ways on amicable terms, and you caress your newly swollen belly -content in the feeling of a job well done.
Alternatively, if you're feeling generous and have two (tragically un-pregnant) holes in desperate need of filling, you can shoo away the beta nyrea, have the alpha nyrea and the botharic stuff you simultaneously, and be left absolutely gravid.
And that's my dream scene that I want to write in the far-away eventuality where I get more gutsy about writing sex.