This is an irregular verb. It follows the conjugation pattern of the verb sentir.
PresentPresente
Los abuelos consienten mucho a sus nietos.
Grandparents pamper their grandchildren a lot.
ImperfectPretérito imperfecto
Mi abuela me consentía con dulces caseros.
My grandmother used to spoil me with homemade sweets.
FutureFuturo
El director no consentirá más retrasos.
The director will not allow any more delays.