Indeed, the second proves that both he and Cavalieri were much pleased with it.
Michelangelo even proceeds to inform Fattucci that Cavalieri "has given me a sonnet which I made for him in those same years, begging me to send it on as a proof and witness that he really is the man intended.

This I will enclose in my present letter." Furthermore, we possess an insolent letter of Pietro Aretino, which makes us imagine that the "ignorance of the vulgar" had already begun to "murmur." After complaining bitterly that Michelangelo refused to send him any of his drawings, he goes on to remark that it would be better for the artist if he did so, "inasmuch as such an act of courtesy would quiet the insidious rumours which assert that only Gerards and Thomases can dispose of them." We have seen from Vasari that Michelangelo executed some famous designs for Tommaso Cavalieri.

The same authority asserts that he presented "Gherardo Perini, a Florentine gentleman, and his very dear friend," with three splendid drawings in black chalk.
Tommaso Cavalieri and Gherardo Perini, were, therefore, the "Gerards and Thomases" alluded to by Aretino.
Michelangelo the younger's and Cesare Guasti's method of defending Buonarroti from a malevolence which was only too well justified by the vicious manners of the time, seems to me so really injurious to his character, that I feel bound to carry this investigation further.
First of all, we ought to bear in mind what Buonarroti admitted concerning his own temperament.

"You must know that I am, of all men who were ever born, the most inclined to love persons.

Whenever I behold some one who possesses any talent or displays any dexterity of mind, who can do or say something more appropriately than the rest of the world, I am compelled to fall in love with him; and then I give myself up to him so entirely that I am no longer my own property, but wholly his." He mentions this as a reason for not going to dine with Luigi del Riccio in company with Donate Giannotti and Antonio Petrejo.
"If I were to do so, as all of you are adorned with talents and agreeable graces, each of you would take from me a portion of myself, and so would the dancer, and so would the lute-player, if men with distinguished gifts in those arts were present.