Symbiotic Summoner

You and one of the creatures you conjure have a bond that allows you to to manifest your own powers through its mind and body.

When you cast a transmutation or abjuration spell with a range of self, 1 of the creatures you have summoned or created with a spell can deliver that spell as if it had casted the spell. Your summoned creature must be within 30 feet of you to use this feature, and it must use its reaction to deliver the spell when you cast it. If the spell requires concentration, the summoned creature concentrates on that spell, but  for that spell's duration you have disadvantage on constitution saving throws you make to maintain concentration. Only 1 creature you have conjured can benefit from this feature at a time.