Multiple nodes within a node
Sounds like you need to use entity reference module and have it render the teaser view mode. 

This field can have unlimited values so you can keep "adding more". This will allow you to specify nodes to embed in another node.

Alternately you can use field collection if you do not require these embedded nodes to be a node on their own. 

Furthermore you could even add a view which shows teasers as a block to bottom of the node, however the filters / contextual filters will be more dynamic in nature rather than manually selecting specific nodes. You could argue that node queue would allow you to do this but I would say thats a lengthy way of resolving you question.