You can see the unpspoken shame and embarrassment in the older boy's gaze. He does not understand how vulnerable he was, to what extreme he was a manipulated victim not a participant and he feels his own sense of guilt for what happened. (he shouldn't, but he does)
He needs now and will need lots of help for a long time. After a few years with his perpatrator he had two possible futures waiting for him, if help did not arrive beforehand - one of constant self-destructive behavior, manifested at times in extreme rage (lashing out) and/or sucicde attmepts - from the erroneous guilt and shame he has acquired, or one of becoming just like his perp. He still has a high risk of self-destructive behavior if he cannot unlearn the guilt and shame.
From what I have seen, the guilt and the shame never leave. The feelings of low self esteem plague these kids for the rest
of their lives.