I thought a bit more about this. Do you enjoy watching them respond emotionally (even if just a little) upon receipt of the item? Is that what makes creation of the suspense fun is the eventual pleasure of seeing them respond happily?
I tried to think upon my INTPs at work, and one sort of does this. He has to come give me updates now and then on the project, but he likes to only give me pieces, and then say funny things like "be happy". This makes me come pester him more and makes for a fun give and take.
I also met a fun INTP the other night at a pub. He hung out with me and my friend for several hours (he has a gf and was visiting from the uk so we were all just having fun) But towards the end of the night he started doing magic tricks for us and we would then try and figure out how he did them. Maybe the same sort of suspense awaiting a fun response?