“Don’t be shy now, I’ve got room for you in here too…”
 
While regrowing as a flower, Withania can reach a point where her pony body is still forming, resulting in an Alraune form of being half-pony, half-literal flower. Her waist down forms into the stem of the flower, from which her sweet and alluring nectar pools.  
Her soft petals are large enough to enclose both herself and another pony inside where it will be quite intimate, that is until the guest finds their body softened and squeezed down the stem itself. Once consumed, the pony dissolves into more nectar and aids in Withania’s regrowth, to be reseeded later.