For me:
The FNIT, was Ennis's sexual awakening. Ennis felt it when Jack took his hand, Ennis didn't think, but acted instinctively. Ennis took Jack naturally, without instruction. Jack submitted to him. But did they understand this was how it was going to be from now on? And up until this point, did Ennis understand this over whelming urge and did he ever feel this for Alma?
The SNIT, Jack guided Ennis, Jack showed Ennis in the ways of making love, the first kiss, arkward, gentle, Jack's assurances that its all right. Ennis totally giving into Jack's body, touching him, smelling him, feeling him. And most importantly the trust they had to have for each other in taking such a step as this. This was intimacy. There was no turning back for either of them, and they knew it.
The "dozy embrace" was totally Jack's understanding of love they had. What was Ennis's "dozy embrace"? I didn't see it. Was it there? I didn't see anything symbolizing Ennis acknowledgement of what they had, until after Jack died, and still it was a symbol more attributed to Jack then to Ennis.