Two foreign keys to the same primary key?

Yes. In fact, this is quite common:

create table tableA
     ( ID     integer    not null 
     , AName  varchar(5) not null
     , constraint A_pk 
         primary key (ID)
     )
create table tableB
     ( AID1   integer  not null
     , AID2   integer  not null
     , Bstuff varchar(9) not null
     , constraint B_pk 
         primary key (AID1,AID2)
     , constraint B_fkA1 
         foreign key (AID1)
              references tableA (ID)
     , constraint B_fkA2 
         foreign key (AID2)
              references tableA (ID)
     )