You were just playing outside in your backyard but you were really bored of playing alone, so you decided to play with your Pokemon friends.

You threw your PokeBall and sent out Plusle and minun. They were much more humanoid and feminine than before, now with breasts and overalls, and were pressing themselves together like magnets, seemingly alluring you to join them

Plu~ Plusle~ (long time no see buddy~) Min~ Minun~ (we can play with you for as long as you want cutie~)