Does one suckling prohibit if the aunt suckles her sister's daughter with her young son, and is it a condition to complete five sucklings within two years for the prohibition?

It has been previously established that the condition for حرمة (prohibition) by fosterage is five sucklings within two years. Therefore, there is no harm in you marrying your خالك (maternal aunt's) son if you are certain that she did not complete five sucklings. However, it must be emphasized that the more cautious approach is to adopt the view of those who say that fosterage, whether little or much, establishes prohibition.